# US 2016/0354525 A1 · Heart assist device with expandable impeller pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0354525 A1 - Document ID: US20160354525A1 - Status: Published application - Kind: A1 - Application number: 15/176,620 - Filed: 2016-06-08 - Published: 2016-12-08 - Earliest claimed: 2006-03-23 - Assignees: The Penn State Research Foundation; Thoratec Corporation - Applicants: The Penn State Research Foundation; Thoratec Corporation - Inventors: Mark W. McBride; David A. Boger; Robert L. Campbell; Gregory P. Dillon; Stephen A. Hambric; Robert F. Kunz; Boris Leschinsky; Thomas M. Mallison; James P. Runt; Justin M. Walsh - Web page: https://patentgrep.com/patent/US20160354525A1 ## CPC - F04D 3/00: Axial-flow pumps (priming or boosting F04D9/00) - A61M 60/13: by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system - A61M 60/148: in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices - A61M 60/174: discharging the blood to the ventricle or arterial system via a cannula internal to the ventricle or arterial system - A61M 60/237: the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps - A61M 60/414: transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter - A61M 60/806: Vanes or blades - A61M 60/808: specially adapted for deformable impellers, e.g. expandable impellers - A61M 60/824: Hydrodynamic or fluid film bearings - A61M 60/865: Devices for guiding or inserting pumps or pumping devices into the patient's body - F04D 3/02: of screw type - F04D 29/181: {Axial flow rotors (F04D29/185 take precedence)} - F04D 29/247: {elastic or self-adjusting} - F04D 29/528: {especially adapted for liquid pumps} - F04D 29/542: {Bladed diffusers (fixing blades to stators F01D9/042)} - A61M 60/829: having a purge fluid supply - A61M 2205/0266: Shape memory materials - B33Y 80/00: Products made by additive manufacturing - F05B 2240/311: flexible or elastic - F05B 2280/5001: Elasticity - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G ## Abstract An impeller includes a hub and a blade supported by the hub. The impeller has a stored configuration in which the blade is compressed so that its distal end moves towards the hub, and a deployed configuration in which the blade extends away from the hub. The impeller may be part of a pump for pumping fluids, such as blood, and may include a cannula having a proximal portion with a fixed diameter, and a distal portion with an expandable diameter. The impeller may reside in the expandable portion of the cannula. The cannula may have a compressed diameter which allows it to be inserted percutaneously into a patient. Once at a desired location, the expandable portion of the cannula may be expanded and the impeller expanded to the deployed configuration. A flexible drive shaft may extend through the cannula for rotationally driving the impeller within the patient. ## Claims ### Claim 1 (canceled) ### Claim 2 A catheter pump comprising: a cannula having an inlet and an outlet; an impeller disposed in the cannula, the impeller sized and shaped to be inserted into a heart of a patient; and a stator disposed downstream of the impeller in the cannula between the impeller and the outlet, the stator configured to reduce swirl velocity from discharge flow from the impeller. ### Claim 3 (depends on 2) The catheter pump of claim 2, wherein the stator comprises an expandable and collapsible structure. ### Claim 4 (depends on 3) The catheter pump of claim 3, wherein the cannula is expandable and collapsible. ### Claim 5 (depends on 4) The catheter pump of claim 4, wherein the impeller is expandable and collapsible. ### Claim 6 (depends on 4) The catheter pump of claim 4, further comprising a retainer sheath, the retainer sheath configured to hold the stator and the cannula in a collapsed configuration when the stator and cannula are disposed in the retainer sheath and in an expanded configuration when urged out of the retainer sheath. ### Claim 7 (depends on 4) The catheter pump of claim 4, wherein the cannula comprises a mesh. ### Claim 8 (depends on 7) The catheter pump of claim 7, further comprising an elastic coating disposed about the mesh. ### Claim 9 (depends on 7) The catheter pump of claim 7, wherein the stator is part of the mesh. ### Claim 10 (depends on 2) The catheter pump of claim 2, wherein the stator comprise blades having an airfoil-type cross-section. ### Claim 11 (depends on 2) The catheter pump of claim 2, wherein the stator comprises a plurality of discharge struts, the plurality of discharge struts defining in part the outlet. ### Claim 12 (depends on 2) The catheter pump of claim 2, wherein the stator comprises a plurality of elements arranged about a central axis of the catheter pump. ### Claim 13 (depends on 12) The catheter pump of claim 12, wherein the plurality of elements comprise a plurality of linear elements arranged in a uniform circular disposition about a central axis of the catheter pump. ### Claim 14 (depends on 2) The catheter pump of claim 2, wherein the stator occupies a short section of the cannula. ### Claim 15 (depends on 2) The catheter pump of claim 2, wherein the stator is disposed proximal the impeller. ### Claim 16 (depends on 2) The catheter pump of claim 2, wherein the cannula comprises a tubular portion which acts as a fluid flow duct, each of the inlet and the outlet tapered radially inwardly relative to the tubular portion. ### Claim 17 (depends on 2) The catheter pump of claim 2, wherein the stator is configured to receive a guidewire therethrough. ### Claim 18 A catheter pump comprising: a cannula having an inlet and an outlet; an impeller disposed in the cannula, the impeller and cannula sized and shaped to be inserted into a heart of a patient; and a plurality of stationary blades disposed downstream of the impeller between the impeller and the outlet, the stationary blades being arranged about a rotational axis of the impeller, the plurality of stationary blades acting as a stator on fluid flowing from the impeller, through the stationary blades and thereafter out of the outlet. ### Claim 19 (depends on 18) The catheter pump of claim 18, wherein the impeller and the cannula are expandable and collapsible. ### Claim 20 (depends on 18) The catheter pump of claim 18, wherein the plurality of stationary blades have air foil cross sections. ### Claim 21 (depends on 18) The catheter pump of claim 18, wherein the plurality of stationary blades are expandable and collapsible. ### Claim 22 (depends on 18) The catheter pump of claim 18, wherein the plurality of stationary blades are disposed proximal the impeller. ### Claim 23 (depends on 18) The catheter pump of claim 18, wherein the stationary blades are coupled with a cylindrical member disposed proximally of the impeller, the cylindrical member being disposed about the rotational axis of the impeller. ### Claim 24 (depends on 23) The catheter pump of claim 23, wherein the stationary blades comprise a first end fixedly attached to the cylindrical member and a free end spaced radially away from the fixed end. ### Claim 25 (depends on 18) The catheter pump of claim 18, wherein the stationary blades comprise an expanded state and wherein a proximal edge of at least one of the stationary blades is inclined distally in the expanded state. ### Claim 26 (depends on 25) The catheter pump of claim 25, further comprising a retainer sheath, the retainer sheath configured to compress the stationary blades to a collapsed state when the retainer sheath is moved distally along the inclined proximal edge, the stationary blades configured to expand into an expanded configuration when the stationary blades are positioned distally of a distal end of the retainer sheath. ### Claim 27 (depends on 18) The catheter pump of claim 18, wherein the stationary blades comprise a plurality of struts of a mesh, the mesh being covered along a length thereof to define a flow conveying structure of the cannula, the stationary blades being positioned adjacent to the outlet.